Recommendation which hardware would be best

[AlexM82]

Hi,

I have a reed-switch telling me via voltage-spike when the control magnet is near. the reed-switch position and the control voltage can be freely chosen. This control circuit is then supposed to switch on the main circuit driving the main coil. So I have just have to read out the reed-switch "on" and "off" status and then switch on one of the relays with a certain delay and for a certain amout of time.

I want to use the NI-hardware to do tweaking on the timing, i.e. adjust firing of main circuit in relation to rpm (initiation, duration,...). It works kind of like commutator in a standard motor.

I thought about the NI-USB-6525. It features 8 digital input lines and 8 fast relays. So is my understanding right, that the digital input is able to interpret the reed-switch as "on" and "off"? Or do i need a analog input for this (unfortunately I didnt find a analog box in combination with the relays) ? And is the hardware fast enough as this motor is supposed to reach some rpms?

Which hardware would you recommend for the described task?

Thank you very much !!

Alex

[Highland_Controls]

Not sure what "fast enough" means, but you will have to monitor the input line in a program, and apply your timing to it, then turn on an output.  The 6525 has solid state relays, but they can not be switched quickly.  They are limited to 5 writes per second.

[AlexM82]

Ah I see. I thought the 5 per second could be reduced by reducing the duty cycle. So i guess its better to go via analog input to read in the reed-switch and analog out to switch on a transistor driving the main coil? 200kS/s should be fast enough even for 2000rpm. Maybe a myDaq can do the job for first testing?

[HeinzG.]

Hi Alex,

why don't you call in at NI with your requirements and ask for a device fitting your needs. They have a better overview of all devices they have in stock and can give you a recommendation.

Here you find the right number:

http://sine.ni.com/apps/utf8/nicc.call_me?p_source=contactni

Kind regards

Heinz

[AlexM82]

Hm gute Idee, Danke!

[HeinzG.]

Gerne - You're welcome.

[AlexM82]

...sorry, that happens when you're in a rush